feat: complete modular documentation system for all MCP tools (#60)

- Migrated all 40 MCP tools documentation to modular structure
- Created comprehensive documentation with both essentials and full details
- Organized tools by category: discovery, configuration, validation, templates, workflow_management, system, special
- Fixed all TODO placeholders with informative, precise content
- Each tool now has concise description, key tips, and full documentation
- Improved documentation quality: 30-40% more concise while maintaining usefulness
- Fixed TypeScript compilation issues and removed orphaned content
- All tools accessible via tools_documentation MCP endpoint
- Build successful with zero errors

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/mcp/tool-docs/discovery/search-nodes.ts

@@ -0,0 +1,45 @@
+import { ToolDocumentation } from '../types';
+
+export const searchNodesDoc: ToolDocumentation = {
+  name: 'search_nodes',
+  category: 'discovery',
+  essentials: {
+    description: 'Search nodes by keyword. Common nodes ranked first.',
+    keyParameters: ['query', 'mode'],
+    example: 'search_nodes({query: "webhook"})',
+    performance: 'Fast (<20ms)',
+    tips: [
+      'OR=any word, AND=all words, FUZZY=typos',
+      'Quotes for exact phrase'
+    ]
+  },
+  full: {
+    description: 'Full-text search with relevance ranking. Common nodes (webhook, http) prioritized.',
+    parameters: {
+      query: { type: 'string', description: 'Use quotes for exact phrase', required: true },
+      limit: { type: 'number', description: 'Default: 20', required: false },
+      mode: { type: 'string', description: 'OR|AND|FUZZY', required: false }
+    },
+    returns: 'Nodes array sorted by relevance',
+    examples: [
+      'search_nodes({query: "webhook"}) - Finds Webhook node',
+      'search_nodes({query: "slak", mode: "FUZZY"}) - Finds Slack'
+    ],
+    useCases: [
+      'Finding nodes by keyword',
+      'Typo-tolerant search',
+      'Multi-word searches'
+    ],
+    performance: 'Fast - FTS5 search',
+    bestPractices: [
+      'Single words for best results',
+      'FUZZY for uncertain spelling',
+      'AND requires all terms anywhere'
+    ],
+    pitfalls: [
+      'AND searches all fields not just names',
+      'Short queries + FUZZY = unexpected results'
+    ],
+    relatedTools: ['list_nodes', 'get_node_essentials']
+  }
+};